Boing is the 9th level of Bloons. It features the Rubber Block for the first time.
- Hitting the fourth rubber block from the top is one way of beating this level.
- It consists of two groups of bloons of differing proportions divided by eight Metal Blocks and a column of rubber blocks on the right side.
- The level requires large use of the newly introduced block, which explains the derivation of the level name.
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